沥青混合料高温性能评价指标

High temperature stability index of hot mixed asphalt

采用车辙试验对同种级配类型的沥青混合料高温性能进行研究,发现沥青混合料高温性能评价指标动稳定度不能反映混合料在整个使用过程中的抗永久变形能力。针对这一缺陷,提出了动抗压强度指标,综合考虑了行车速率、累积变形量和最大永久变形量等因素对压实沥青混合料高温性能的影响。结果表明:动抗压强度指标能较好地体现工程实际中车辙的形成规律,并有效提高了对沥青混合料高温性能评价的区分率。

This paper studied the high temperature stability of the HMA （hot mixed asphalt） to the same aggregate gradation by rutting test. It was pointed that the traditional dynamic stability index for evaluating the high temperature stability of the HMA can not cover the permanent deformation resistamce throughout the whole pavement service life, therefore the dynamic compression strength, a new index for evaluating the whole term high temperature stability, is presented. It combines the influence factors of velocity, cumulative deformation and maximal permanent deformation. The results indicate that the dynamic compressin strength can reflect the rut formation regular in projects, and has an effectual distinction for evaluating the high temperature stability of the HMA. 3 tabs, 5 figs, 7 refs.